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GRE - Quantitative Reasoning - Word Problems

A group can charter a particular aircraft at a fixed total cost. If 36 people charter the aircraft rather than 40 people, the cost per person is greater by $12. What is the cost per person if 40 people charter the aircraft?

A group can charter a particular aircraft at a fixed total cost. If 36 people charter the aircraft rather than 40 people, the cost per person is greater by $12. What is the cost per person if 40 people charter the aircraft? 

Let the total cost of chartering aircraft be x

Cost per person for 40 people = x/40

Cost per person for 36 people = x/36

given in the question

x/36 = x/40 + 12

x/360 = 12

x = $4320

Cost per person if 40 people charter the aircraft = 4320/40 = $108